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diff --git a/dev/ci/docker/README.md b/dev/ci/docker/README.md
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+## Overall Docker Setup for Coq's CI.
+
+This directory provides Docker images to be used by Coq's CI. The
+images do support Docker autobuild on `hub.docker.com` and Gitlab's
+private registry.
+
+Gitlab CI will build and tag a Docker by default for every job if the
+`SKIP_DOCKER` variable is not set to `false`. In Coq's CI, this
+variable is usually set to `false` indeed to avoid booting a useless
+job.
+
+## Manual Building
+
+You can also manually build and push any image:
+
+- Build the image `docker build -t base:$VERSION .`
+
+To upload/push to your hub:
+
+- Create a https://hub.docker.com account.
+- Login into your space `docker login --username=$USER`
+- Push the image:
+  + `docker tag base:$VERSION $USER/base:$VERSION`
+  + `docker push $USER/base:$VERSION`
+
+## Debugging / Misc
+
+To open a shell inside an image do `docker run -ti --entrypoint /bin/bash <imageID>`
+
+Each `RUN` command creates an "layer", thus a Docker build is
+incremental and it always help to put things updated more often at the
+end.
+
+## Possible Improvements:
+
+- Use ARG for customizing versions, centralize variable setup;
diff --git a/dev/ci/docker/bionic_coq/Dockerfile b/dev/ci/docker/bionic_coq/Dockerfile
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+# CACHEKEY: "bionic_coq-V2018-05-07-V2"
+# ^^ Update when modifying this file.
+
+FROM ubuntu:bionic
+LABEL maintainer="e@x80.org"
+
+ENV DEBIAN_FRONTEND="noninteractive"
+
+RUN apt-get update -qq && apt-get install -y -qq m4 wget time gcc-multilib opam \
+        libgtk2.0-dev libgtksourceview2.0-dev \
+        texlive-latex-extra texlive-fonts-recommended hevea \
+        python3-sphinx python3-pexpect python3-sphinx-rtd-theme python3-bs4 python3-sphinxcontrib.bibtex python3-pip
+
+RUN pip3 install antlr4-python3-runtime
+
+# Basic OPAM setup
+ENV NJOBS="2" \
+    OPAMROOT=/root/.opamcache \
+    OPAMROOTISOK="true"
+
+# Base opam is the set of base packages required by Coq
+ENV COMPILER="4.02.3" \
+    BASE_OPAM="num ocamlfind jbuilder ounit"
+
+RUN opam init -a -y -j $NJOBS --compiler="$COMPILER" default https://opam.ocaml.org && eval $(opam config env) && opam update
+
+# Setup of the base switch; CI_OPAM contains Coq's CI dependencies.
+ENV CAMLP5_VER="6.14" \
+    COQIDE_OPAM="lablgtk.2.18.5 conf-gtksourceview.2" \
+    CI_OPAM="menhir elpi ocamlgraph"
+
+RUN opam switch -y -j $NJOBS "$COMPILER" && eval $(opam config env) && \
+    opam install -j $NJOBS $BASE_OPAM camlp5.$CAMLP5_VER $COQIDE_OPAM $CI_OPAM
+
+# base+32bit switch
+RUN opam switch -y -j $NJOBS "${COMPILER}+32bit" && eval $(opam config env) && \
+    opam install -j $NJOBS $BASE_OPAM camlp5.$CAMLP5_VER
+
+# BE switch
+ENV COMPILER_BE="4.06.1" \
+    CAMLP5_VER_BE="7.05" \
+    COQIDE_OPAM_BE="lablgtk.2.18.6 conf-gtksourceview.2"
+
+RUN opam switch -y -j $NJOBS $COMPILER_BE && eval $(opam config env) && \
+    opam install -j $NJOBS $BASE_OPAM camlp5.$CAMLP5_VER_BE $COQIDE_OPAM_BE
+
+# BE+flambda switch
+RUN opam switch -y -j $NJOBS "${COMPILER_BE}+flambda" && eval $(opam config env) && \
+    opam install -j $NJOBS $BASE_OPAM camlp5.$CAMLP5_VER_BE $COQIDE_OPAM_BE $CI_OPAM